Data Link Layer Overview Quiz

Redundancy in error detection methods involves adding extra bits to the data unit in order to detect and correct errors at the destination. This involves using techniques such as parity check, cyclic redundancy check (CRC), and checksum to ensure data integrity during transmission.

The different types of errors that can occur in data transmission are single-bit errors and burst errors. A single-bit error involves only one bit in the data unit changing, while a burst error means that 2 or more bits in the data unit have changed.

The parity check method is used for error detection by adding an extra bit (parity bit) to the data unit to ensure that the total number of 1s in the unit is always either even or odd. If the parity bit does not match the expected parity, an error is detected.

Cyclic Redundancy Check (CRC) is a method of error detection that involves adding a fixed number of check bits to the data unit. These check bits are generated based on the polynomial division of the data unit, and they allow the receiver to detect any errors in the received data.

Error detection and correction are crucial for ensuring reliable communication during data transmission. By detecting and correcting errors, the integrity of the transmitted data can be maintained, thereby enabling accurate and error-free communication.

To ensure that errors are identified and flagged for correction

An error that affects 2 or more bits in the data unit

Parity check

LLC manages flow control while MAC manages medium access control

$802.3$